package control;

import entity.Category;
import entity.Product;
import entity.ProductAvailability;
import java.io.IOException;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import utils.ServletUtil;

@WebServlet(name = "ProductList", urlPatterns = {"/ProductList"})
public class ProductList extends HttpServlet {
    
    protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        EntityManagerFactory fact = Persistence.createEntityManagerFactory("vh11i_jeePU");
        EntityManager em = fact.createEntityManager();

        try {
            long categoryId = ServletUtil.getLong(request.getParameter("category_id"), -1);
            
            Query query_categorie = em.createNamedQuery("getCategoryById", Category.class);
            query_categorie.setParameter("categoryId", categoryId);
         
            Category category = (Category) query_categorie.getSingleResult();
            
            request.setAttribute("categoryById", category);
            
            Query query = em.createNamedQuery("productByCategorieId", Product.class);
            query.setParameter("categoryId", categoryId);
            //laat producten met status unavailable niet zien
            query.setParameter("availabilityEnum", ProductAvailability.UNAVAILABLE); 
            List<Product> productList = query.getResultList();
            
            request.setAttribute("productListbyCat", productList);
        }
        finally {
            em.close();
            fact.close();
        }
        
        /*
        try {
            // Zoek de categorie via id (staat in de querystring)
            long categoryId = ServletUtil.getLong(request.getParameter("category_id"), -1);
            
            Query query = em.createNamedQuery("allCategories", Category.class);
            List<Category> categories = query.getResultList();
            request.setAttribute("categories", categories);
            
            Product productList = em.find(Product.class, categoryId);
            request.setAttribute("product", productList);
            
            if (productList != null && request.getMethod().equals("GET")) {
            }
        }
        finally {
            em.close();
            fact.close();
        }
        */
        
        RequestDispatcher dispatcher = request.getServletContext().getRequestDispatcher("/productList.jsp");
        dispatcher.forward(request, response);
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
